Séminaire Matrices et graphes aléatoires (MEGA)

Les thèmes abordés incluent

Prochaine séance

Vendredi 17 mai à l'Institut Henri Poincaré, salle Mirzakhani (201)

Abstract: I will first introduce the concept of noncommutative probability, then review the basics of the combinatorial theory of classical/free/Boolean probability. Finally, we will see that it may be surprizingly fruitful in some situations to use tools from one theory in situations where they are rather unexpected.

Abstract: I will discuss results for the derivative of the characteristic polynomial of a unitary matrix drawn at random from the Circular Unitary Ensemble (CUE). We obtain a formula for the non-integer moments in terms of a confluent hypergeometric function, valid in the limit of large matrix dimension. The approach is based on the theory of log-correlated Gaussian fields. I will discuss possible implications of our results for derivative moments of the Riemann zeta function. This is joint work with Fei Wei (University of Oxford).

Abstract: In this presentation we will study multi-matrix models whose potentials are perturbations of the quadratic potential associated with independent GUE random matrices. More precisely, one can compute the free energy and the expectation of the trace of polynomials evaluated in those matrices. We prove an asymptotic expansion in the inverse of the matrix dimension to any order. Out of this result we deduce new formulas for map enumerations and the microstates free entropy. The approach that we take is based on the interpolation method between random matrices and free operators developed in earlier works.

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Histoire

Le séminaire MEGA a été créé en 2014 par Djalil Chafaï et Camille Male avec l'aide de Florent Benaych-Georges.

Image est tirée de https://www.mat.tuhh.de/forschung/aa/forschung.html.